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Volume 46, Issue 7
Displaying 1-11 of 11 articles from this issue
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Acoustic emission testing and Infrared thermographyTatsuo Yamauchi, Koji Murakami1992 Volume 46 Issue 7 Pages 835-841
Published: July 01, 1992
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSAcoustic emission testing method and thermography are briefly described in the respects of their principle, measurement method and main information obtained for the purpose of investigating the deforming and fracturing precesses of paper.View full abstractDownload PDF (7180K) -
Toshiyasu Nishioka1992 Volume 46 Issue 7 Pages 842-852
Published: July 01, 1992
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSIn this paper, at first an outline about the general design and the role of SBR latices for paper coating is given, and then the relation between improved SBR latex design and these five items mentioned below are discussed with some experimental data.
(1) The compatibility of dry-pick strength and blister resistance.
(2) Print gloss improvement.
(3) The compatibility of dry-pick strength and stiffness.
(4) Rotogravure printability.
(5) The control of coating color rheology.
It is additionally stated that the further advance of table scale evaluation methods, which is much closer to practical conditions, would be one of the most important things in order to ensure the progress of coated papers in future.View full abstractDownload PDF (1236K) -
Youhei Shiokoshi1992 Volume 46 Issue 7 Pages 853-861
Published: July 01, 1992
Released on J-STAGE: November 16, 2009
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Part 2 Sludge Dehydrators[in Japanese]1992 Volume 46 Issue 7 Pages 862-875
Published: July 01, 1992
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESS(1) As compared with last questionnaire (1983), the average numbers of dehydrator installed each mill has decreased from 6.3 to 3.9.
(2) The most popular dehydratortype is Screwpress, and next is Beltpress. The shar of Screwpress is about 50%.
(3) The total amount of dehydrated sludge is 4, 900 ton per day in bone dried base. The sludge amount is increasing 1.8 times of the last questionnaire ; however, the ratio of the amount of the dehydrated sludge to the pulp and paper production has decreased from 4.4% to 3.8%.View full abstractDownload PDF (1549K) -
1992 Volume 46 Issue 7 Pages 876-884
Published: July 01, 1992
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (3811K) -
Basics of Surface AnalysesAkira Isogai1992 Volume 46 Issue 7 Pages 885-891
Published: July 01, 1992
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (1014K) -
[in Japanese]1992 Volume 46 Issue 7 Pages 895
Published: July 01, 1992
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (243K) -
Kyoji Suzuki, Mikiaki Takahashi, Takeo Ueno, Takatoshi Koyakumaru1992 Volume 46 Issue 7 Pages 896-902
Published: July 01, 1992
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSCorrugated fiberboards of AA-grade and their base papers-i. e., liner and medium sheets, were irradiated with dosages of 10, 25, 50, 100 kGy, and effect of gamma irradiation on the brightness and strength properties were investigated.
Changes in brightness values were within 0.5% for all irradiated sheets studied, and there was no visual change on the surface. Compressive strength and wet tensile strength of paperboards did not deteriorate up to the dosage of 100 kGy. Dry tensile strength of paperboards decreased with increasing dosages after the transient increase at 10 kGy, and reduction rate was kept within 15% even after 100 kGy irradiation. Burst-, tear- and punctute-strength also decreased with increasing dosages, but those reduction rate after 100 kGy were kept in the range of 30-40%. In our studies, only folding endurance markedly decreased with increasing dosages.
Burst strength reduction of corrugated fiberboard was within 10% at 25 kGy (usual sterilizing dosage), and reduction behavior was almost similar to that of base paperboard. However, puncture strength reduction of corrugated fiberboard was lower than that of paperboard. Reduction ratio of compressive strength and that of adhesive strength between liner and medium were within 10% even after 100 kGy irradiation.
In conclusion, there was no significant reduction in the mechanical properties of corrugated fiberboard and paperboards due to gamma irradiation except for folding endurance. Therefore, it is thought to be no problem for the practical use of corrugated fiberboard cases in sterilizing operations by gamma-rays.View full abstractDownload PDF (899K) -
Quantitative analysis of pigments by new sample preparation and application to commercial coated papersToshiharu Enomae, Fumihiko Onabe, Makoto Usuda1992 Volume 46 Issue 7 Pages 903-911
Published: July 01, 1992
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe X-ray diffractometry was applied to examination of kinds of pigment and absolute weight of respective pigments for manually-coated papers and commercial coated papers. The authors proposed in the previous paper the method of quantifying weight ratio of pigments in the coating. However, the application of the method was confined to the basesheet containing known amount of filler of the same kind. Then, the new method of preparation for the X-ray diffraction sample without information about basesheet was established. This method also makes is possible to eliminate the influence of the kaolin pigments orientation. Moreover, it has an advantage of distinguishing the crystal forms.
The process of sample preparation is as follows. First a coated paper sample was fixed on a polyethylene film by a 2-sided adhesive tape or agent with the coating surface adhered to the film. Next, the sample was immersed in a cupric ethylenediamine solution for one day to swell and dissolve the fibers. After washing with a calcium carbonate saturated solution, it was carbonized at 280°C. An appropriate quantity of KBr was added to the powdered sample as an internal standard. The mixed sample was submitted to X-ray diffraction.
The following is the results obtained.
1. The weight of pigments of manually-coated papers was determined by X-ray diffractometry. The obtained values were almost same as those by gravimetric method.
2. The ratios of respective pigments of commercial coated papers are almost equal to those measured by X-ray microanalysis which is a conventional technique for quantitative analysis.View full abstractDownload PDF (1188K) -
Measurement with Commercial Formation TesterJunji Ohsawa, Tsutomu Naito1992 Volume 46 Issue 7 Pages 912-927
Published: July 01, 1992
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe formation of wood-free printing paper and plain paper electrophotographic paper (PPC) was evaluated with several commercial sheet formation testers in order to investigate the characteristics and problems of recently-developed sheet formation testers. This paper deals with the characteristics of evaluation method of sheet formation with light transmission image and with results, especially sheet formation indexes obtained from each apparatus.View full abstractDownload PDF (11411K) -
1992 Volume 46 Issue 7 Pages 928-933
Published: July 01, 1992
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (744K)
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